#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 20, 4);
#include <EEPROM.h>
int m,v,vo,vu,dl,dly,dly1,tmp;
unsigned long vtm;
bool st,dt;

#define ENCODER_CLK 2
#define ENCODER_DT  3
#define ENCODER_SW  4

void setup(){
  Serial.begin(9600);

  lcd.init();
  lcd.backlight();
  pinMode(5,OUTPUT);
  pinMode(ENCODER_CLK, INPUT);
  pinMode(ENCODER_DT, INPUT);
  pinMode(ENCODER_SW, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(ENCODER_CLK), readEncoder, FALLING);
  

   lcd.setCursor(0,0);     
   lcd.print("MAIN:250V OP:OFF");
   lcd.setCursor(0,1);     
   lcd.print("OU:250-210V D:10");
 
   vo=EEPROM.read(0);
   vo=vo+EEPROM.read(1)*100;
   if(vo>300) vo=0;
  vu=EEPROM.read(2);
   if(vu>200) vu=0;
   dl=EEPROM.read(3);
   if(dl>50) dl=0;
}

void loop(){
   for(int i=0;i<500;i++){
  v=analogRead(A0);
  
  v=map(v,0,1023,0,655);
  vtm=vtm+v;
  }
  dly1++;
  if(dly1>9){dly1=0;dt=!dt;}
 v=vtm/5000;
 v=(v*10);
 //if(v<0)v=0;
 vtm=0;
  if(v<vu|v>vo){
     digitalWrite(5,0);
    dly=dly1=0;dt=1;
  }
   if(v>vu&v<vo-1){
    if(dly<dl&dly1==9)dly++;
    if(dly==dl){ digitalWrite(5,1);dt=1; }
    }
     
  if(m==0){
  
lcd.setCursor(5,0); 
if(v<100)lcd.print(" "); 
   lcd.print(v);
   lcd.setCursor(13,0); 
   if(digitalRead(5))lcd.print("ON ");
   else  lcd.print("OFF");
   //lcd.print("MAIN:250V OP:OFF");
   lcd.setCursor(3,1); 

if(vo<100)lcd.print(" "); 
   lcd.print(vo);   
   lcd.setCursor(7,1); 
   lcd.print(vu); 
   if(vu<100)lcd.print("V ");
   else lcd.print("V");  
   lcd.setCursor(14,1); 
  if(dt|digitalRead(5)) lcd.print(dl); 
  else lcd.print("  ");
lcd.print(" ");


}
if (digitalRead(ENCODER_SW) == LOW){st=0;}
  
  if(st==0){
    lcd.clear();
   m++;
   if(m>3){
    lcd.setCursor(0,0);     
   lcd.print("MAIN:250V OP:OFF");
   lcd.setCursor(0,1);     
   lcd.print("OU:250-210V D:10");
   EEPROM.update(0,vo%100); 
   EEPROM.update(1,vo/100); 
    EEPROM.update(2,vu); 
    EEPROM.update(3,dl); 
    m=0;}
   
    st=1;
    }
  
  if(m==1){
  
lcd.setCursor(0,0); 
lcd.print(" SET OVER-VOLT  ");
   lcd.setCursor(6,1); 
   lcd.print(vo);    

}
  if(m==2){
  
lcd.setCursor(0,0); 
lcd.print(" SET UNDER-VOLT ");
   lcd.setCursor(6,1); 
   lcd.print(vu); 

}
  if(m==3){
  
lcd.setCursor(0,0); 
lcd.print("  SET ON-DELAY  ");
   lcd.setCursor(7,1); 
   lcd.print(dl);    
lcd.print(" "); 
}
}

void readEncoder() {
  int dtValue = digitalRead(ENCODER_DT);
  if (dtValue == HIGH) {
    //counter++; // Clockwise
      if(m==1)vo+=10;
  
   if(m==2)vu+=10;
    if(m==3)dl+=1;
    if(vo>300)vo=300;
    if(vu>200)vu=200;
    if(dl>50)dl=50;
   st=1;

  }
  if (dtValue == LOW) {
    //counter--; // Counterclockwise
      if(m==1)vo-=10;
   if(m==2)vu-=10;
    if(m==3)dl-=1;

    if(vo<200)vo=200;
    if(vu<100)vu=100;
    if(dl<0)dl=0;
   st=1;
  }
}